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An empirical study of the surface blush in gas-assisted injection molded parts / S. J. Liu in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 1 (03/2002)
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Titre : An empirical study of the surface blush in gas-assisted injection molded parts Type de document : texte imprimé Auteurs : S. J. Liu, Auteur ; I.-H Lin, Auteur Année de publication : 2002 Article en page(s) : p. 60-66 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Gas-assisted injection molding of thermoplastic materials has become an important process in industry, because of its capability of producing parts that have thick and thin sections with a good structured rigidity. However, there are some unsolved problems that confound the overall success of this technique. Surface blush of the molded parts caused by glossy difference of the materials is one of them. An L’18 experimental matrix design based on the Taguchi method was conducted to investigate the surface blush of gas-assisted injection molded thermoplastics. The material used was black-pigmented polypropylene. Experiments were carried out on a 4.1 oz reciprocating injection-molding machine equipped with a high-pressure nitrogen-gas injection unit. A plate cavity with gas channels of different geometry was used to mold the parts. After molding, the surface quality of the parts was characterized by a glossmeter. For the factors selected in the main experiments, mold temperature and gas pressure were found to be the principal factors affecting the surface quality of gas-assisted injection molded parts. The surface glossy difference increases with the content of the pigment in the materials. In addition, a trapezoidal gas channel of small width was found to mold the parts with the least glossy difference. An aluminium mold helps reducing the surface blush in molded parts. Note de contenu : - Effects of processing parameters
- Significance of processing parameters
- Effect of pigmentation
- Effect of gas channel geometry
- Effect of mold materialDOI : 10.3139/217.1667 En ligne : https://drive.google.com/file/d/1pYuL96FT0N3Lnjftx6YpYMMFgkeyMijN/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15987
in INTERNATIONAL POLYMER PROCESSING > Vol. XVII, N° 1 (03/2002) . - p. 60-66[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001019 - Périodique Bibliothèque principale Documentaires Disponible An experimental setup to measure the transient temperature profiles in water assisted injection molding / S.-J. Liu in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 3 (07/2009)
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Titre : An experimental setup to measure the transient temperature profiles in water assisted injection molding Type de document : texte imprimé Auteurs : S.-J. Liu, Auteur ; P.-C. Su, Auteur Année de publication : 2009 Article en page(s) : p. 234-241 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Water assisted injection molding technology has gradually become an important process for making hollow plastic parts, due to its light weight, relatively lower resin cost per part, faster cycle time, and its flexibility in the design and manufacture of plastic parts. Study of the temperature profiles in molded parts is of fundamental importance to a more complete understanding of many complicated phenomena. This report presents a novel experimental setup which allows the in-situ measurement of three-dimensional temperature field in the depth of molded parts throughout the molding cycles. A specific mold equipped with tubular needles for guiding embedded micro-thermocouples was designed and manufactured. Experiments were carried out on a lab developed water assisted injection-molding system, which included an injection molding machine, a water pump, a water injection pin, a water tank equipped with a temperature regulator, and a control circuit. The resin used was semi-crystalline polypropylene. The in-cavity temperature of the polymeric materials during the molding cycle was measured. In addition, an unsteady-state, nonlinear heat transfer model of water assisted injection molding has been proposed to numerically simulate the in-depth temperature profiles. It is shown that the numerical predictions are in good agreement with experimental data. Experimental investigation and numerical simulations of a water assisted injection molding cooling process will provide an improved understanding of the influence of water related parameters on the cooling process of water assisted injection molded parts. DOI : 10.3139/217.2233 En ligne : https://drive.google.com/file/d/1nLCSNMtRT2wWe8wuQf3Pp090QT3nYl3X/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5926
in INTERNATIONAL POLYMER PROCESSING > Vol. XXIV, N° 3 (07/2009) . - p. 234-241[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 011432 - Périodique Bibliothèque principale Documentaires Disponible An experimental study on the pickout of scaled-up gravure cells / H.-K. Chuang in INTERNATIONAL POLYMER PROCESSING, Vol. XXIII, N° 2 (05/2008)
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Titre : An experimental study on the pickout of scaled-up gravure cells Type de document : texte imprimé Auteurs : H.-K. Chuang, Auteur ; C.-C. Lee, Auteur ; T.-J. Liu, Auteur Année de publication : 2008 Article en page(s) : p. 216-222 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : An Experimental Study on the Pickout of Scaled-up Gravure Cells DOI : 10.3139/217.2134 En ligne : https://drive.google.com/file/d/1WACBxffthLhqcqb7yqOKOjuSumcJ7ygb/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2651
in INTERNATIONAL POLYMER PROCESSING > Vol. XXIII, N° 2 (05/2008) . - p. 216-222[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 010098 - Périodique Bibliothèque principale Documentaires Disponible An experimental study on the role of manufacturing parameters on the dry sliding wear performance of additively manufactured PETG / Berkay Ergene in INTERNATIONAL POLYMER PROCESSING, Vol. 37, N° 3 (2022)
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Titre : An experimental study on the role of manufacturing parameters on the dry sliding wear performance of additively manufactured PETG Type de document : texte imprimé Auteurs : Berkay Ergene, Auteur ; Cagin Bolat, Auteur Année de publication : 2022 Article en page(s) : p. 255-270 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Frottements (mécanique)
Impression tridimensionnelle
Matériaux -- Epaisseur
Mesure
Polyéthylène téréphtalate glycol
Taux de remplissage (technologie)
Tribologie (technologie)
Usure (mécanique)Index. décimale : 668.9 Polymères Résumé : Additive manufacturing (AM) is a versatile and promising method for rapid prototyping and advanced design applications. Owing to its unique potential for fast production rates, and capacity of creating complex shapes, the number of researches on AM techniques have increased day by day in the technical literature. In this work, contrary to common literature efforts focused on mechanical properties, friction and wear behaviors of additively manufactured PETG samples were analyzed experimentally. As a methodology, fused filament fabrication (FFF) was selected. In order to explore the influence of manufacturing factors on wear properties, layer thickness (0.1, 0.2, and 0.3 mm), infill rate (40, 60, 80, and 100%), and building direction (vertical and horizontal) were changed. Before the friction tests, dimensional accuracy, hardness, and surface roughness measurements were conducted to interpret better the wear results. In addition, macroscopic and microscopic inspections were performed to determine the correct reason behind the deformation. From the data collected during the tests, there was a positive interaction between volume loss and layer thickness. Besides, there was no direct interaction between infill rate/building direction and coefficient of friction. In comparison with vertically built samples, horizontally built samples were subjected to more plastic deformation, and their worn surfaces were severely damaged. Note de contenu : - MATERIAL AND METHODOLOGY : Filament material and manufacturing - Dimensional accuracy measurements - Hardness measurements - Surface roughness measurements - Wear test procedure
- RESULTS AND DISCUSSION : Dimensional accuracy - Hardness - Surface roughness - Tribological properties - Wear mechanisms
- Table 1 : Material properties of PETG filament
- Table 2 : 3D printing process parameters
- Table 3 : The average accuracy percentage obtained from dimensional measurements of cylindrical sampleDOI : https://doi.org/10.1515/ipp-2021-0015 En ligne : https://drive.google.com/file/d/12N5Uiq-s3wa6d0OOg1JqCYh_QpvMA-b5/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37905
in INTERNATIONAL POLYMER PROCESSING > Vol. 37, N° 3 (2022) . - p. 255-270[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23738 - Périodique Bibliothèque principale Documentaires Disponible An improvement on design of sheet extrusion dies / G.-J. Yang in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 4 (12/2005)
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Titre : An improvement on design of sheet extrusion dies Type de document : texte imprimé Auteurs : G.-J. Yang, Auteur ; J.-B. Chen, Auteur ; C.-Y. Shen, Auteur ; X.-C. Huang, Auteur Année de publication : 2005 Article en page(s) : p. 336-344 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : On the basis of the method of representative values and the flow pattern, that is, the position of the isobars parallels to the die orifice (PIPDO), the design of dies for the sheet and annular parisons is improved in the present paper. Since this pattern includes the effects of the sloped manifold and the die design for the circular manifold are independent of flow rate and the polymer viscosity, the distribution system of a die gives better uniformity of flow. In the previous study [1] a defect is found, that is, the calculated position of the path of the island area lags behind actual position. This defect is eliminated, and the modified equation is obtained. Another flow pattern, the pressure loss on all flow path is equal (PLFPE), is introduced. The equivalency of the above two flow patterns is proved theoretically. Although the flow uniformity isn’t perfect in the simplified analytical design of dies proposed in the previous paper, this simplified design is still of advantages. Therefore, its design criterion is put forward in this paper. En ligne : https://drive.google.com/file/d/1wOkJbL1zLR1BMMGVryTzbVLkfWgwRJM2/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2958
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Code-barres Cote Support Localisation Section Disponibilité 003422 - Périodique Bibliothèque principale Documentaires Disponible An integrated approach for numerical analysis of coupled flow and heat transfer in co-rotating twin screw extruders / Dylan M. Kalyon in INTERNATIONAL POLYMER PROCESSING, Vol. XXII, N° 3 (07/2007)
PermalinkAn investigation of venturi and coanda effects in blown film cooling / V. Sidiropoulos in INTERNATIONAL POLYMER PROCESSING, Vol. XV, N° 1 (03/2000)
PermalinkAn investigation on usage of sodium borohydride and zinc oxide as oxygen scavengers in polyethylene terephthalate films / Ilhan Özen in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 4 (08/2012)
PermalinkAnalyse du comportement des matériaux métastables / Jürgen Schawe in MATERIAUX & TECHNIQUES, Vol. 98, N° 4 (2010)
PermalinkAnalyse des courbes de décharge en nanoindentation dans le cas des polymères massifs / M. Beyaoui in MATERIAUX & TECHNIQUES, Vol. 96, Hors série (2008)
PermalinkAnalyse de la dégradation thermique du poly(éther éther cétone) / Emilie Courvoisier in MATERIAUX & TECHNIQUES, Vol. 105, N° 4 (2017)
PermalinkAnalyse de la dégradation thermique du poly(éther imide) / Emilie Courvoisier in MATERIAUX & TECHNIQUES, Vol. 105, N° 4 (2017)
PermalinkAnalyse in situ de contact viscoélastique sur polymère vitreux / Anne Rubin in MATERIAUX & TECHNIQUES, Vol. 103, N° 6 (2015)
PermalinkAnalyse par dichroïsme infrarouge de la relaxation d'orientation de mélanges binaires de polystyrène / C. Hayes in LES CAHIERS DE RHEOLOGIE, Vol. XI, N° 3-4 (10/1993)
PermalinkL'analyse des polymères pour optimiser le recyclage / Kévin Menard in PLASTIQUES & CAOUTCHOUCS MAGAZINE, N° 891 (02/2012)
PermalinkAnalyse Raman in situ de la déformation d'un hydrogel nanocomposite / Maria Trouilh in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 24, N° 1 (01-02-03/2014)
PermalinkAnalyse rhéologique de réseaux de poly(diméthylsiloxane) chargés à la silice / F. Clément in LES CAHIERS DE RHEOLOGIE, Vol. XVI, N° 1 (10/1998)
PermalinkAnalyse théorique d'écoulements élongationnels non uniformes en relation avec des procédés de mise en forme et les prédictions de certaines lois de comportement / Magdeleine Normandin in LES CAHIERS DE RHEOLOGIE, Vol. XI, N° 3-4 (10/1993)
PermalinkAnalyses des sillons viscoélastiques lors d'un contact entre une pointe rigide et la surface d'un polymère / H. Pelletier in MATERIAUX & TECHNIQUES, Vol. 96, N° 3 (2008)
PermalinkAnalysis and optimization of kenics static mixers / O. S. Galaktionov in INTERNATIONAL POLYMER PROCESSING, Vol. XVIII, N° 2 (06/2003)
PermalinkAnalysis of film blowing with flow-enhanced crystallization / L. K. Henrichsen in INTERNATIONAL POLYMER PROCESSING, Vol. XXII, N° 2 (05/2007)
PermalinkAnalysis of film blowing with flow-enhanced crystallization / L. K. Henrichsen in INTERNATIONAL POLYMER PROCESSING, Vol. XXII, N° 2 (05/2007)
PermalinkAnalysis of flow and heat transfer in liquid composite molding / B. Yu in INTERNATIONAL POLYMER PROCESSING, Vol. XV, N° 3 (09/2000)
PermalinkAnalysis of heat flux from molten polymers to molds in injection molding processes / Y. Shiraishi in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 2 (06/2002)
PermalinkAnalysis of heat transfer in PVC profiles during the extrusion calibration/cooling step / P. Mousseau in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 2 (05/2009)
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